package com.example.gmapfroyotest;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import com.example.gmapfroyotest.R.bool;

import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteException;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;

public class DataBaseHelper extends SQLiteOpenHelper{

	
    //The Android's default system path of your application database.
    String DB_PATH =null;  
    private static String DB_NAME = "mydatabase";   
    private SQLiteDatabase myDataBase;    
    private final Context myContext;
    /**
     * Constructor
     * Takes and keeps a reference of the passed context in order to access to the application assets and resources.
     * @param context
     */
    public DataBaseHelper(Context context) {
        super(context, DB_NAME, null, 1);
        this.myContext = context;
        DB_PATH="/data/data/"+context.getPackageName()+"/databases/";
    }   
  
  /**
     * Creates a empty database on the system and rewrites it with your own database.
     * */
    public void createDataBase() throws IOException{
        boolean dbExist = checkDataBase();
       /* if(dbExist){
            //do nothing - database already exist
        }else{
            //By calling this method and empty database will be created into the default system path
               //of your application so we are gonna be able to overwrite that database with our database.
            try {
            	this.getReadableDatabase();
                copyDataBase();
            } catch (IOException e) {
                throw new Error("Error copying database");  
            }
        }*/
        if(!(dbExist))
        {	
        	this.getReadableDatabase();
            copyDataBase();
        }
    }
  
    /**
     * Check if the database already exist to avoid re-copying the file each time you open the application.
     * @return true if it exists, false if it doesn't
     */
    private boolean checkDataBase(){
  
        SQLiteDatabase checkDB = null;
        try{
            String myPath = DB_PATH + DB_NAME;
            checkDB = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
        }catch(SQLiteException e){
            //database does't exist yet.
        }
        if(checkDB != null){
            checkDB.close();
        }
        return checkDB != null ? true : false;
    }
  
    /**
     * Copies your database from your local assets-folder to the just created empty database in the
     * system folder, from where it can be accessed and handled.
     * This is done by transfering bytestream.
     * */
    private void copyDataBase() throws IOException{
  
     
        //Open your local db as the input stream
        //InputStream myInput = myContext.getAssets().open(DB_NAME);
        File file = new File(myContext.getDatabasePath(this.DB_NAME).toString());
		//InputStream myInput = new FileInputStream(file);
		InputStream myInput=myContext.getAssets().open("mydatabase.sqlite");
		int size = myInput.available();
		/*byte[] buffer =new byte[size];
		myInput.read(buffer);
		myInput.close();
		String text=new  String(buffer);
		Log.d("from text file->",text);*/
        // Path to the just created empty db
        String outFileName = DB_PATH + DB_NAME;
  
        //Open the empty db as the output stream
        OutputStream myOutput = new FileOutputStream(outFileName);
  
        //transfer bytes from the inputfile to the outputfil
        byte[] buffer = new byte[1024];
        int length;
        while ((length = myInput.read(buffer))>0){
            myOutput.write(buffer, 0, length);
        }
  
        //Close the streams
        myOutput.flush();
        myOutput.close();
        myInput.close();
  
    }
  
    public void openDataBase() throws SQLException{
  
        //Open the database
        String myPath = DB_PATH + DB_NAME;
        myDataBase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
  
    }
  
    @Override
    public synchronized void close() {
  
            if(myDataBase != null)
                myDataBase.close(); 
            super.close(); 
    }
     
     
  
    @Override
    public void onCreate(SQLiteDatabase db) {
  
    }
  
    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
  
    }
 //return cursor
    public Cursor query(String table,String[] columns, String selection,String[] selectionArgs,String groupBy,String having,String orderBy){
        return myDataBase.query("poslovniceConv", null, null, null, null, null, null);     
    }
    public Cursor queryLanLon(String table,String[] columns, String selection,String[] selectionArgs,String groupBy,String having,String orderBy){
    	return myDataBase.query(table, columns, selection,selectionArgs, groupBy, having, orderBy);     
    }


}
